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50 lines
1.5 KiB
50 lines
1.5 KiB
var createWrapper = require('./_createWrapper'),
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getHolder = require('./_getHolder'),
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replaceHolders = require('./_replaceHolders'),
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rest = require('./rest');
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/** Used to compose bitmasks for wrapper metadata. */
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var PARTIAL_FLAG = 32;
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/**
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* Creates a function that invokes `func` with `partials` prepended to the
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* arguments it receives. This method is like `_.bind` except it does **not**
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* alter the `this` binding.
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*
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* The `_.partial.placeholder` value, which defaults to `_` in monolithic
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* builds, may be used as a placeholder for partially applied arguments.
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*
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* **Note:** This method doesn't set the "length" property of partially
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* applied functions.
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*
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* @static
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* @memberOf _
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* @since 0.2.0
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* @category Function
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* @param {Function} func The function to partially apply arguments to.
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* @param {...*} [partials] The arguments to be partially applied.
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* @returns {Function} Returns the new partially applied function.
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* @example
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*
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* var greet = function(greeting, name) {
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* return greeting + ' ' + name;
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* };
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*
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* var sayHelloTo = _.partial(greet, 'hello');
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* sayHelloTo('fred');
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* // => 'hello fred'
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*
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* // Partially applied with placeholders.
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* var greetFred = _.partial(greet, _, 'fred');
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* greetFred('hi');
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* // => 'hi fred'
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*/
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var partial = rest(function(func, partials) {
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var holders = replaceHolders(partials, getHolder(partial));
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return createWrapper(func, PARTIAL_FLAG, undefined, partials, holders);
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});
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// Assign default placeholders.
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partial.placeholder = {};
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module.exports = partial;
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